package com.nowcoder.community.controller;

import com.nowcoder.community.entity.Event;
import com.nowcoder.community.entity.Page;
import com.nowcoder.community.entity.User;
import com.nowcoder.community.event.EventProducer;
import com.nowcoder.community.service.FollowService;
import com.nowcoder.community.service.UserService;
import com.nowcoder.community.util.CommunityConstant;
import com.nowcoder.community.util.CommunityUtil;
import com.nowcoder.community.util.HostHolder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * <p>Title: FollowController</p>
 * <p>author 12427</p>
 *
 * @version ver1.0
 * @date 2022/8/20 20:51
 */
@Controller
public class FollowController implements CommunityConstant {

    @Autowired
    private FollowService followService ;

    @Autowired
    private HostHolder hostHolder ;

    @Autowired
    private UserService userService ;

    @Autowired
    private EventProducer eventProducer ;

    @RequestMapping(path = "/follow" , method = RequestMethod.POST)
    @ResponseBody
    public String follow(int entityType , int entityId){
        User user = hostHolder.getUser() ;
        followService.follow(user.getId() , entityType , entityId);

        // 触发关注事件
        Event event = new Event()
                .setTopic(TOPIC_FOLLOW)
                .setUserId(hostHolder.getUser().getId())
                .setEntityType(entityType)
                .setEntityId(entityId)
                .setEntityUserId(entityId) ;

        eventProducer.fireEvent(event);



        return CommunityUtil.getJSONString( 0 , "关注成功 (p≧w≦q)") ;
    }

    @RequestMapping(path = "/unfollow" , method = RequestMethod.POST)
    @ResponseBody
    public String unfollow(int entityType , int entityId){
        User user = hostHolder.getUser() ;
        followService.unfollow(user.getId() , entityType , entityId);

        return CommunityUtil.getJSONString( 0 , "你取消了关注 o(╥﹏╥)o") ;
    }

    @RequestMapping(path = "/followees/{userId}" , method = RequestMethod.GET)
    public String getFollowees(@PathVariable("userId") int userId , Page page , Model model) {
        User user = userService.findUserById(userId);
        if(user == null) {
            throw new RuntimeException("该用户不存在!") ;
        }
        model.addAttribute("user" , user) ;

        page.setLimit(5);
        page.setPath("/followees/" + userId);
        page.setRows((int) followService.findFolloweeCount(userId , CommunityConstant.ENTITY_TYPE_USER));

        List<Map<String,Object>> userList = followService.findFollowees(userId , page.getOffset() , page.getLimit()) ;
        if(userList != null){
            for(Map<String,Object> map  : userList) {
                User u = (User)map.get("user");
                map.put("hasFollowed" , hasFollowed(u.getId())) ;

            }
        }

        model.addAttribute("users" , userList) ;
        return "/site/followee" ;
    }

    @RequestMapping(path = "/followers/{userId}" , method = RequestMethod.GET)
    public String getFollowers(@PathVariable("userId") int userId , Page page , Model model) {
        User user = userService.findUserById(userId);
        if(user == null) {
            throw new RuntimeException("该用户不存在!") ;
        }
        model.addAttribute("user" , user) ;

        page.setLimit(5);
        page.setPath("/followers/" + userId);
        page.setRows((int) followService.findFollowerCount( CommunityConstant.ENTITY_TYPE_USER,userId ));

        List<Map<String,Object>> userList = followService.findFollowers(userId , page.getOffset() , page.getLimit()) ;
        if(userList != null){
            for(Map<String,Object> map  : userList) {
                User u = (User)map.get("user");
                // 判断当前用户是否对userId关注
                map.put("hasFollowed" , hasFollowed(u.getId())) ;

            }
        }

        model.addAttribute("users" , userList) ;
        return "/site/follower" ;
    }


    /**
     * 查看当前在线用户是否关注了userId
     * @param userId
     * @return
     */
    private boolean hasFollowed(int userId){
        if(hostHolder.getUser() == null) {
            return false ;
        }
        return followService.hasFollowed(hostHolder.getUser().getId() , ENTITY_TYPE_USER , userId) ;
    }

}
